I am a fairly new user of Ubuntu, and currently have two 12.04 installations, one of which seems to work ok but I have two problems. The problem I'm asking about in this question, is that the Dash search seems unable to find things, such as "additional drivers" or "update". On my working machine, searching for "additional drivers" there finds an icon for the driver program, but on the problem machine, it gives "Sorry, there is nothing that matches your search."

Dash also only shows sections for Recent Files, and Downloads, on that machine. The account I'm running is an admin account.

This installation also has a stuck Ubuntu Software Center (it loads and hangs) as in threads like this one.

I don't think I've done very much to this computer that could cause a problem. I installed g++ and Wt to do some programming. The biggest change I can remember is uninstalling the newfangled scrollbars with "sudo apt-get remove liboverlay-scrollbar3-0.2-0", but re-installing that module seems to have no effect on these issues.

Anyone have any ideas?

Both machines have been updated with all recommended updates and say they are up to date.